
/**
 * 拼接新参数
 */
exports.extend = function extend(target) {
    var sources = Array.prototype.slice.call(arguments, 1);
  
    for (var i = 0; i < sources.length; i += 1) {
      var source = sources[i];
      for (var key in source) {
        if (source.hasOwnProperty(key)) {
          target[key] = source[key];
        }
      }
    }
  
    return target;
  };
